/*
 * (c) Copyright 2007, 2008 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package arq.examples.filter;

import com.hp.hpl.jena.sparql.expr.NodeValue;
import com.hp.hpl.jena.sparql.function.FunctionBase1;

/**
 * Example filter function that returns an indicative type string.
 * <ul>
 * <li>"Number", if it's a number of some kind</li>
 * <li>"String", if it's string</li>
 * <li>"DateTime", if it's a date time</li>
 * <li>"unknown" otherwise</li>
 * </ul>
 * 
 * Usage:
 * 
 * <pre>
 *    PREFIX ext: &lt;java:arq.examples.ext.&gt;
 * </pre>
 *  <pre>
 *    FILTER ext:classify(3+?x)
 *  &lt;pre&gt;
 * &#064;author Andy Seaborne
 * 
 */

public class classify extends FunctionBase1 {
	public classify() {
		super();
	}

	// @Override
	public NodeValue exec(NodeValue v) {
		if (v.isNumber())
			return NodeValue.makeString("number");
		if (v.isDateTime())
			return NodeValue.makeString("dateTime");
		if (v.isString())
			return NodeValue.makeString("string");

		return NodeValue.makeString("unknown");
	}
}

/*
 * (c) Copyright 2007, 2008 Hewlett-Packard Development Company, LP All rights
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. The name of the author may not
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */